ICTS:29461

Video URL

Measurement-induced phase transitions in Josephson junction arrays and oscillator chains

Measurement-induced phase transitions in Josephson junction arrays and oscillator chains

(2024). Measurement-induced phase transitions in Josephson junction arrays and oscillator chains. SciVideos. https://youtu.be/6ImKVHalEcw

Measurement-induced phase transitions in Josephson junction arrays and oscillator chains. SciVideos, Aug. 29, 2024, https://youtu.be/6ImKVHalEcw 

          @misc{ scivideos_ICTS:29461,
            doi = {},
            url = {https://youtu.be/6ImKVHalEcw},
            author = {},
            keywords = {},
            language = {en},
            title = {Measurement-induced phase transitions in Josephson junction arrays and oscillator chains},
            publisher = {},
            year = {2024},
            month = {aug},
            note = {ICTS:29461 see, \url{https://scivideos.org/icts-tifr/29461}}
          }
Sumilan Bannerjee
Talk numberICTS:29461
Source RepositoryICTS-TIFR
Source EventQuantum Information, Quantum Field Theory and Gravity
Collection

Abstract

In quantum many-body systems, ‘measurement-induced phase transitions’ (MIPT), have led to a new paradigm for dynamical phase transitions in recent years. I will first discuss a model of continuously monitored or weakly measured arrays of Josephson junctions (JJAs) with feedback. Using a combination of a variational self-consistent harmonic approximation and analysis in the semiclassical limit, strong dissipation limit, and weak coupling perturbative renormalization group, I will show that the model undergoes reentrant superconductor-insulator MIPTs in its long-time non-equilibrium steady state as a function of measurement strength and feedback strength. I will contrast the phase diagram of monitored JJA with the well-studied case of dissipative JJA. In the second part of the talk, starting from a similar model of a continuously monitored chain of coupled anharmonic oscillators with feedback, I will show that the quantum dynamics maps to a stochastic Langevin dynamics with noise strengt...